Intermediate turbine ducts are used in modern multi-spool jet engines to connect the high pressure turbine with the lowpressure turbine. The trend towards turbofan engines with larger by-pass ratios requires the radial off-set between the high-pressure and low-pressure turbines to increase with a corresponding increase in radial off-set for the intermediate turbine ducts. Other improvements of the ducts is to make them shorter and more diffusing but this strive towards more aggressive design increases the risk for separation. This paper deals with an experimental investigation of the time-averaged mean flow field and turbulence development in an aggressive intermediate turbine duct (downstream a rotating turbine stage) using a 5-hole probe and 2-component hot-wire anemometry. In addition the duct endwall static pressure distribution is discussed. The investigation revealed the complex flow structure development within the duct, where corotating vortices emanating from the break-up of the tip gap shear-layer dominates the flow pattern.

Länka till denna publikation

Dela på webben

Skapa referens, olika format (klipp och klistra)

BibTeX @conference{Axelsson2008,author={Axelsson, Lars-Uno and Johansson, T. Gunnar},title={Experimental investigation of the time-averaged flow in an intermediate turbine duct},booktitle={GT2008-50829. Proceedings of ASME Turbo Expo 2008: Power for Land, Sea and Air, June 9-13, 2008, Berlin, Germany},abstract={Intermediate turbine ducts are used in modern multi-spool jet engines to connect the high pressure turbine with the lowpressure turbine. The trend towards turbofan engines with larger by-pass ratios requires the radial off-set between the high-pressure and low-pressure turbines to increase with a corresponding increase in radial off-set for the intermediate turbine ducts. Other improvements of the ducts is to make them shorter and more diffusing but this strive towards more aggressive design increases the risk for separation. This paper deals with an experimental investigation of the time-averaged mean flow field and turbulence development in an aggressive intermediate turbine duct (downstream a rotating turbine stage) using a 5-hole probe and 2-component hot-wire anemometry. In addition the duct endwall static pressure distribution is discussed. The investigation revealed the complex flow structure development within the duct, where corotating vortices emanating from the break-up of the tip gap shear-layer dominates the flow pattern.},year={2008},}

RefWorks RT Conference ProceedingsSR ElectronicID 73045A1 Axelsson, Lars-UnoA1 Johansson, T. GunnarT1 Experimental investigation of the time-averaged flow in an intermediate turbine ductYR 2008T2 GT2008-50829. Proceedings of ASME Turbo Expo 2008: Power for Land, Sea and Air, June 9-13, 2008, Berlin, GermanyAB Intermediate turbine ducts are used in modern multi-spool jet engines to connect the high pressure turbine with the lowpressure turbine. The trend towards turbofan engines with larger by-pass ratios requires the radial off-set between the high-pressure and low-pressure turbines to increase with a corresponding increase in radial off-set for the intermediate turbine ducts. Other improvements of the ducts is to make them shorter and more diffusing but this strive towards more aggressive design increases the risk for separation. This paper deals with an experimental investigation of the time-averaged mean flow field and turbulence development in an aggressive intermediate turbine duct (downstream a rotating turbine stage) using a 5-hole probe and 2-component hot-wire anemometry. In addition the duct endwall static pressure distribution is discussed. The investigation revealed the complex flow structure development within the duct, where corotating vortices emanating from the break-up of the tip gap shear-layer dominates the flow pattern.LA engDO 10.1115/GT2008-50829LK http://dx.doi.org/10.1115/GT2008-50829OL 30